Παραπομπή APA

Hopke, W. E. (1972). encyclopedia of carrers and vocational guidance. J.G.Ferguson.

Παραπομπή Chicago Style

Hopke, William E. Encyclopedia of Carrers and Vocational Guidance. Chicago: J.G.Ferguson, 1972.

Παραπομπή MLA

Hopke, William E. Encyclopedia of Carrers and Vocational Guidance. J.G.Ferguson, 1972.